Siphon spillway



'July 8, 1930. LAWA'CZECK 1,770,340

S IPHON SPILLWAY Filed June 20, 1927 /n vet) for. Franz Zawaezeck waterin the river consumes far more head tion andforming part thereof aretaining -Pa.tented July 8, 1930 i a I 2 g 7 11 770 349 FRANZLAWAGZECK, on MUNICH, rGE BIM'ALN Y SIPfHON SPILLWAY i Application filedJune 2-0, 1927, SerialvNo. zoousaana in German June 21, 1926.

My invention refers to the art, of hydraulic lerel predetermined formean and low water engineering and provides means for utiliz-l isoverstepped,by quickly and automatically ing to the utmost extent thehead and water exhausting air from the siphon; In. conse-' power offlowing waters, for instance rivers, ,quence of this arrangement theedge of the" 5 at mean andlow water, whi'le avoiding the weir no moredetermines the head and'the 55 danger from: high'water. I p starting atthesiphon and the great advanf' In the utilization of the head andhytage is obtained that the top edge of the Weir draulic power of riversone is constantlyconneed not extend exactly in a'lioriZontalvline:fronted with the problem, how to deal'with- In spite thereof theadjusting ofthewater; re the water in rivers provided with weirs-orlevel is eiiected in a more sensitive"manner 60 retaining dams in suchmanner that the head than in those cases where the water level is atmean and low water will correspond apmade dependent from th e height'Qf-theweir proximately to the usualhead at high water edge." 1' furtherimportantadvanta ge rer without allowing the head at high water to 1sults from the daming up of low and mean 15 get so high as to allow thewater tooverfiow water to the high water level, because now 5 the banksbelow the wei the cross-sectional area of the river bed at The presentinvention in dealing with this high waterywhich is utilized only duringthe problem makes use of the well known sipbons short period of highwater, now constitutes extending across the top of the'weirs for conapowerful accumulator for normal opera- 2e veying across the weir thesurplus water to tion so that'atleast one daily make up .for the 79 bedisposed of during the periods *of high surplus output of thepower's'tation'cannow water. 7 I I beacc umulated in thespace of theriver bed,

As is well known high water in consewhich was hitherto not'utilized;quence of the greater velocity of flow of the In the drawings affixed tothis specifica- F by friction and eddying per unit of cross-. damembodying my invention "is illustrated sectional area than thecomparatively small 'diagramm'atically by way of example. quantity ofmean and low water. Therefore In the drawings, v 1. hitherto theoverflow edge of the retaining r Fig. l is a sectionof the-dam withfth'e'30 dams had to be disposed at a considerably siphon extending acrossfit a ndwith auto-f, lower level thanjwould be admissible for low maticmeans. for "setting same-operating. and mean'water in order to preventthe water Fig. 2 is a diagram showing an' improved from overflowing thebanks in front of the gonstrugfion' f the, d' j f tu tin th weir inspite of the materially higher banksi ho pf Q I 1 u 1 mg curveextending-upstream. i The loss of 1 Referring first to Fig 17 is'the m 6head hereby occaslpnea at low d m is its top and f is the siphonextending i 15 Very (ionsldemble" t? f tl across the tope in s'uchmanner that its upper I m tnvers fm img fiif :33:3 admissionedge grissituated below the upper I7:l-; tli l 1e wl iich i s 'a i ailable; fo1'utiliZa Wat?! l l uppellnexharustredge hielgw tion I p a i r the rowwater level. ii'XfiQtly at upper water These drawbacks are avoidedaccording to f e 7 aSTtO dfab9rmme ed t e 1S dlsposed- V the presentinvention by automatically keepme top of d ing the head higher at normaland low water i i' y P h y If Q 45 than at high water; the head and dropat 9a Whlch drives P ma- Sue-4 hi h Water b i d t in d b th uppgrtionpipe k of which sucksair from the sum admission edge of the wellknown siphons 311i? Q the 91 bend F by sefts 9" extending across thedani,.which is arranged siphon operating. The air compressed by at acorrespondingly lower leveht-he siphon theengine m can for instance beconducted 5% being set operating; whenever the-upstrean together withthe exhaust water from the engine m to the low water level by means ofthe canal n formed in the dam (Z.

The siphons f can always be sufi'iciently etfioient to suck off morewater than will how in at times of high water. By quickly andautomatically exhausting the air from the siphon f by means of the tubef) and engine m, a quick starting of the siphon is provided for at themoment, when the upper water level predetermined for mean and low wateris overstepped. lVhenever high Water is imminent, the siphons will acttowards lowering the upper water level down to that level which isdetermined by tne admission edges g. Thus two different upper waterlevels are created according to whether the siphon is operating or not.during low and mean water, t 1e upper water level is kept by theadmission edge 2' of the funnel at a predetermined level which in allcases is higher than the level now used. On the other hand, it duringhigh water the siphon f is inoperation, the upper water level willgbelowered down to the admission edge 9 of the siphon which is arrangedbelow the edge 2' of the funnel. The difference of level between theedge 9 {LDC the highest water level at low water is such that thelowering of the upper water level brought about by 7 means of the siphonf suiiicies to carry the justable either before or during operation inorder to be able to regulate the upper water level. This is illustratedin Fig. 2 together with very sensitive means for setting the siphon 7'operating. Here the upper funnel-shaped part 2' of the tube 6 leading tothe engine m is movable and is adjusted by a float g or the like andlever 1 which is supported on the arm 3) 01" tube 2' If the upper waterlevel exceeds a predetermined level, the admission funnel 2' is loweredquickly and thereby causes the exhausting engine m and the siphon. f'tobe quickly started operating. Although afterwards the air pump isstopped by lowering the tloat (I and raising the funnel i the siphon fwill nevertheless continue its operation until the high water wave hasdisappeared altogether and the upper water level has sunk below theadmission edge g of the siphon. Only after this has taken place, the airentering the siphon 7 will stop its operation.

The newdam above described, while forming a very sensitive means ofadjusting the upper water .evel, also affords a possibility of producinga higher head with quantities of water which are less than thequantities to be disposed of athigh water. I thereby obtain a gainot'etli iency of the water power plant as a whole and also a greaterdepth of the river for the purposes of navigation. The top of the weirwhich can be disposed at any Inthe latter case, that is.

desired height above the highest normal water level, need not extendexactly in the horizontal.

I wish it to be understood that I do not desire to be limited to theexact details of construction shown and described obvious modificationswill occur to a person skilled in the art.

I claim 1 1. A siphon spillway comprising a siphon and automaticstarting means therefor, an adjustable admission member for the water toactuate said starting means being arranged at the highest admissibleupstream level.

2. A siphon spillway comprising a siphon and automatic starting meanstheretor, an adjustable admission member for the water to actuate saidstarting means being arranged at the upstream level and a float foradjusting said member.

In testimony whereof I affix my signature.

FRANZ LAWACZECK.

